Effect of Trivalent Additions and Processing on Structural and Magnetic Transitions in Ni-Mn-Ga Ferromagnetic Shape Memory Alloys

被引：5
|
作者：
Mathur, R. P. [1 ]
Singh, R. K. [1 ]
Ray, S. [2 ]
Ghosal, P. [1 ]
Chandrasekaran, V. [1 ]
机构：
[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India
[2] Indian Inst Technol, Roorkee 247667, Uttar Pradesh, India
来源：
DEFENCE SCIENCE JOURNAL | 2012年 / 62卷 / 04期
关键词：
Ferromagnetic shape memory alloys; Ni-Mn-Ga alloys; martensitic transformation; PHASE; TRANSFORMATIONS;
D O I：
10.14429/dsj.62.1279
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Ferromagnetic shape memory Ni50Mn30Ga15Al5-xBx (x = 0, 1, and 4) alloys were prepared by vacuum arc melting and subsequent heat-treatment as well as by melt spinning to investigate the effect of trivalent element additions in ternary Ni-Mn-Ga alloys. The heat-treated alloys containing Al were reported to possess a modulated martensite structure, however alloy containing both Al and B showed a loss of modulated structure in martensite formed. The rapidly solidified alloys on the other hand showed the formation of a similar modulated structure without composition change in alloys containing Al and the alloys containing Al and B. In addition, the former showed a presence of an amorphous phase with latter showing crystalline boron rich phases. The magnetisation of the B containing alloys in both the processing technique was however very low, showing lower magnetic exchange interaction in such alloys.
引用
收藏
页码：252 / 260
页数：9
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